Hi Dan,IEC and EN standards are used in the EPAC standard in section 2 as normative references, and specificaly in section 4 maximum power measurement. it is quite normal for standards to use references to other bodies. saves reinventing the wheel so to speak
Until the UK law is aligned, it would be an interesting debate as to whether the new EN EPAC standard applied here. I don't think its called up, either specifically or by default, but I imagine courts would take note of it if there were no other guidance.
I'm interested in these cases you mention of people having to defend against charges that their e-bikes were motorised vehicles. Can you give some more details, please?
Nick